lets try it this way:
i'm a prospective buyer of a brand new 84 caprice classic, and you are a salesman trying to sell one of the last three on the lot before the end of the 84 model year. one has an F40 suspension and one has an F41. the other has the stock, no options suspension.
you are trying to sell me the F41. (more expensive)
i am asking you why i want to spend the extra $49 and what it will get me.
what is in it that is better than the $26 HD suspension or the free stock suspension.
SELL ME THE CAR.
i want to know the parts involved in the extra cost